Tor Browser on OS X doesn't open the link after it launches

When Tor Browser is set as the default browser on OS X, and isn't already open, and I click on a link, it doesn't open that link. Once it has launched, it opens subsequent links.

A simple workaround is to never close Tor Browser, or to click on the link again after it finishes opening.

I think this happens because the "open" event (containing the link) gets sent to Tor Launcher, which doesn't send it on to Tor Browser.

This happens in both Tor Browser 5 and Tor Browser 5.5.

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